title: Near-infrared broadband absorber with film-coupled multilayer nanorods.
abstract: Turning the surfaces of noble metals (metasurfaces) into black (highly absorptive) surfaces can be potentially applied in thermophotovoltaics, sensing, tailoring thermal emissivity, etc. Here we demonstrate an extremely broadband absorber for the 900-1600 nm wavelength range with robust high absorption efficiency. The inexpensive droplet evaporation method is implemented to create patterns of nanoparticles dispersed on a gold film spaced by a thin dielectric layer. The diversity of the complicated random stacking of the chemically synthesized gold nanorods is the major factor for the broad absorption band. Such a metamaterial absorber may pave the way for cost-effective manufacture of large-area black metasurfaces.
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Xingxing
authors.initials: X
authors.lastname: Chen
authors.forename: Hanmo
authors.initials: H
authors.lastname: Gong
authors.forename: Shuowei
authors.initials: S
authors.lastname: Dai
authors.forename: Ding
authors.initials: D
authors.lastname: Zhao
authors.forename: Yuanqing
authors.initials: Y
authors.lastname: Yang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Qiu